I agree this is an interesting topic and and interesting discussion. Thank you for bringing it here.
That said, I still think this study on "domestication" is more a study on selective breeding in general and had little to do with Canidae domestication. Evolutionary domestication theorists have never even agreed on whether humans domesticated dogs, or the dogs themselves took an evolutionary turn due to habitat/environmental issues amongst other things and became adept at insinuating themselves into hunter/gatherer sub cultures, thus domesticating themselves.
This experiment was, for lack of a better term, forced domestication resulting in a breed of foxes now ready for sale to anyone with a little money and wire cage in the back yard. In addition, the now domesticated fox has different social, emotional, and veterinarian needs due to this project. So now we have a wild-domesticated animal, dependent on humans for food, shelter, and love, and it lives in the backyard in a wire cage.
IMO this is the same as the neighbor with the dog chained in the backyard to the tree, given food and water and basic health care but no love.
Like I said, interesting study. But what's in store emotionally for these now pseudo dogs? They're just for sale. They deserve better than a twice a day feeding and a year round backyard cage. Where's the compassion, the warm bed, and the human contact they have now learned to expect and deserve?